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Table 6 Summary of proposed survival strategies of the isolates and their possible origin

From: Resilient microorganisms in dust samples of the International Space Station—survival of the adaptation specialists

Isolated microbial genus

Possible origin

Proposed survival strategy

References

Bacillus

HA, CR, ISS

Endospores

[7783]

Paenibacillus

CR, ISS

Endospores

[7881]

Salinibacillus

HA, ENV

Endospores

[40, 84]

Micrococcus

HA, CR, ISS, IA

Intrinsic desiccation resistance

[81, 82, 8588]

Cupriavidus

CR, ISS

Various DNA-repair mechanisms; adapted to extreme, metal-rich, anthropogenic environments

[78, 89]

Methylobacterium

CR, ISS, IA

Intrinsic desiccation resistance

[5, 14, 20, 82, 90]

Bradyrhizobium

CR, ISS

Intrinsic desiccation resistance

[5, 14, 20, 81, 82, 91]

  1. Legend: HA human-associated; CR reported in spacecraft assembly clean room(s) before; ISS reported in ISS before; ENV environmental; IA indoor air